SQL Duplicate columns

Question

Assume i have two tables R(A,B) and S(A,D)

1. Select * from R,S

2. Select * from R,S where R.A>S.A

What will be the name/number of columns on both of these cases?

Comments

now also in both cases you will get 4 columns (R.A , B , S.A , D)...because 'from' operator(SQL) work just like cross product(Relational algebra)...

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when query executed 4 columns are possible because it gives cross product

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when i execute this query i got 3 coloumns in both cases with different number of rows